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Hydrogen Evolution from Water by Visible Light, a Homogeneous Three Component Test System for Redox Catalysis
Author(s) -
Kalyanasundaram Kuppuswamy,
Kiwi John,
Grätzel Michael
Publication year - 1978
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19780610740
Subject(s) - chemistry , triethanolamine , photochemistry , aqueous solution , catalysis , photodissociation , redox , kinetics , visible spectrum , water splitting , electron transfer , radical ion , hydrogen , acceptor , photocatalysis , inorganic chemistry , analytical chemistry (journal) , organic chemistry , ion , optoelectronics , quantum mechanics , condensed matter physics , physics
Irradiation by visible light of a neutral aqueous solution containing Ru (bipy) 3 2+as a sensitizer, methylviologen (MV +2 ) as an electron acceptor and triethanolamine or cysteine as an electron donor leads to the formation of stable methylviologen radical cation (MV + ). The kinetics and mechanism of the photoinduced reactions occurring in such a system were explored by laser photolysis technique. In the presence of Adams catalyst MV + is reoxidized by water under simultaneous evolution of hydrogen. Optimum conditions for the water reduction under continuous illumination are elaborated and implications for an energy conversion system discussed.